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I can't find any useful specs on that fixture other than wattage. It uses epistar leds, so at best I'd say that it's capable of producing 2.0umoles/watt. 1200 umoles ppf distributed over the 1.5 sq meters in a 4x4 should give you an average ppfd of 800 across that area. That should work quite well.

This ismy 4-tote UC setup I built 3 years ago. 17 gallon totes with 6"netlids connected with 2" pvc. I run a 700gph mag drive recirc pump for waterfalls/oxygenation and a 396gph magdrive connected to a 1/4hp chiller. I just finished my winter grow on a mono-crop of Primal Punch and I'm over a...

I've been growing dwc/rdwc for 5 years now. One issue you are going to encounter is keeping your solution cool. My first 3 years were done running bennies in an attempt to keep root funk from forming in the rez. I usually do a rez dump every 14 days. Since I use leds, I need to keep the room...

Yep, I learned that on my first coco run. If I waited too long between feedings, I would see all kinds of def/tox symptoms on the leaves.

me neither..Florida muck, now that's another story.

One of the pheno's from some Primal Punch regs I have fox-tails like a mofo, but it grows absolute fire nugs. Definitely not a huge yielder, but it grows excellent meds.

I find that without using supplemental co2,750 ppfd is about the max most of the strains I've run can handle without signs of distress. A pair of the sf1000's will produce about 500 umoles ppf and since you're spreading that out over about 1/2 sq meters it will produce a spot ppfd of 1000 across...

It says that each generates about 250 umoles ppf, so a pair should be able to get that space to over 1000ppfd. Dimming would be a good feature.

That's just under 1/2 sq meters, so I'd look for a fixture that can generate about 300 umole ppf.

A 3x3 is just under a square meter of canopy. I would look for a fixture that's capable of generating at least 750 umole ppf to achieve a ppfd over 750. Spider farmer specs the sf1000 at 250umole ppf, so it would require 3 of those fixtures to achieve what I would call adequate lighting levels.

As wizzlebiz mentioned, more info on the grow will help with any suggestions.

um, OK...

I'd say that if you want to use your timber in another grow, I'd look for 500-600 watts of top-tier diodes. I run a 480-watt qb clone fixture in my 4x4 pheno tent and it does a good job except for the very edge of the tent. I'd say the original qb550 fixture is more suited to a 3x3 for best quality.

Can you post some pics of both old and new growth?

Either trellis netting rigged up to your tent poles or perhaps some tomato stakes if you're in soil or coco. I'd also suggest some selective pruning. Those are going to get VERY thick when you flip them.

Looks a lot like cannabis...other than that, IDK.

I think that most single-end 1000w hps can generate around 1500-1600 umoles ppf. A top-tier led fixture using lm301 diodes will need 600 watts to achieve that output. Blurples will need the same amount of power as the hid fixture to achieve the same intensity.

Timber offers a quality product. That fixture would crush a 2x4 footprint.

What really sucked was when you ran out of clean rolls and had to reuse them...

Any chance of you posting a link to the fixtures you're using so we can offer some help???